Secure Computing SG300 User Manual page 196

Note
For each of the email clients for which to scan incoming mail, the email client's POP3
user name setting must be in the form of user@mail.isp.com, rather than simply user –
user is the POP3 login, and mail.isp.com is the POP3 mail server.
Additionally, the email client's incoming/POP3 email server setting must be sent to the
SnapGear unit's LAN IP address (e.g. 192.168.0.1).
Typically it is not necessary to adjust the POP3 protocol Request timeout.
Once POP3 scanning is functioning properly, you may choose to Reduce syslog output.
Click Submit.
SMTP email
If you have an SMTP mail server on your LAN, the SG can scan emails sent to it by
external mail servers.
Check Virus check SMTP based email.
Enter your LAN's SMTP mail server address as the Destination SMTP server.
Check Send keep alive bytes to requesting server to send keep alive traffic to the
source SMTP server. This option is only useful on slow network connections where the
source server is timing out before the SnapGear unit has finished its virus checking.
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Firewall